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btrfs: delete unused member nobarriers

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The last consumer of nobarriers is removed by the commit [1] and sync
won't fail with EOPNOTSUPP anymore. Thus, now when write cache is write
through it just return success without actually transpiring such a
request to the block device/lun.

[1]
commit b25de9d6da
block: remove BIO_EOPNOTSUPP

And, as the device/lun write cache state may change dynamically saving
such as state won't help either. So deleting the member nobarriers.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2017-04-06 11:22:52 +08:00 committed by David Sterba
parent 28d70e237d
commit 13e88e1560
2 changed files with 0 additions and 4 deletions
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3
fs/btrfs/disk-io.c
View File

@ -3521,9 +3521,6 @@ static int write_dev_flush(struct btrfs_device *device, int wait)
struct bio *bio;
int ret = 0;
if (device->nobarriers)
return 0;
if (wait) {
bio = device->flush_bio;
if (!bio)

1
fs/btrfs/volumes.h
View File

@ -123,7 +123,6 @@ struct btrfs_device {
struct list_head resized_list;
/* for sending down flush barriers */
int nobarriers;
struct bio *flush_bio;
struct completion flush_wait;